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Device Therapy for Sudden Cardiac Death Prophylaxis After Acute Coronary Syndrome: When and Why?

Faheemullah Beg1, Miguel Valderrabano2, Paul Schurmann3

  • 1Department of Cardiology, Houston Methodist Debakey Heart & Vascular Center, Houston, TX, USA.

Current Cardiology Reports
|January 18, 2020
PubMed

Insights

Implantable cardioverter-defibrillators (ICDs) effectively prevent sudden cardiac death in select patients with ischemic cardiomyopathy. Recent trials clarify indications for both primary and secondary prevention, establishing ICDs as crucial for high-risk individuals.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Medical Device Technology

Background:

  • Implantable cardioverter-defibrillators (ICDs) are vital for preventing sudden cardiac death (SCD) in ischemic cardiomyopathy.
  • Indications and optimal timing for ICDs in acute coronary syndromes remain areas of investigation.

Purpose of the Study:

  • To review clinical trials defining the indications for cardiac defibrillators in patients with coronary artery disease.
  • To synthesize evidence for both primary and secondary prevention of SCD.

Main Methods:

  • Systematic review of key clinical trials including AVID, CIDS, CASH, MADIT, CABG Patch, MUSTT, MADIT-II, DINAMIT, IRIS, and VEST.
  • Analysis of trial outcomes regarding all-cause mortality, arrhythmic death, and patient subgroups.

Main Results:

  • Secondary prevention trials (AVID, CIDS, CASH) demonstrate reduced mortality and arrhythmic death.
  • Primary prevention trials (MADIT, MADIT-II, etc.) refined indications, showing greatest benefit in patients with reduced ejection fraction and specific post-myocardial infarction or revascularization timelines.
  • The VEST trial found wearable cardioverter-defibrillators (WCDs) did not reduce arrhythmic deaths in patients without ICD indications.

Conclusions:

  • Cardiac defibrillators are effective in carefully selected patients for preventing sudden cardiac death.
  • Evidence consistently supports defibrillator use in both primary and secondary prevention settings for appropriate patient groups.

Keywords:
Acute coronary syndromeImplantable cardioverter-defibrillatorSudden cardiac deathVentricular arrhythmiasWearable cardioverter-defibrillator

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